Change-speed gearing



` H. P. SAUNDERSON.

CHANGEJSPEED GEARING. Pue/mon mw APR. l. ma.

1,339,477. Panted May 11, 1920.

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CHANGE-SPEED GEARING.

Specification of Letters Patent.

Patented May 11, 1920.

Application filed April 1, 1918. Serial No. 226,066.

To aZZ whom t may concern:

Be it known that I, HERBERT PERoY SAUNDERsoN, a subject of the King ofGreat Britain, residing at Elstow Works, Bedford, England, have inventednew and useful Improvements in or Connected with Change- Speed Gearing,of which the following is a specification.

My invention relates to change speed gear for motor tractors and thelike, and has for its object to simplify the construction thereof. l

According to my invention the gearing with its box and the operatinglevers forms practically an independent unit which can be readilydismounted from the chassis. The box is made in two main parts, thelower of which is directly secured to the chassis, while the upper partis bolted to the lower and is provided with a removable cover through.which access can be readily obtained to the interior of the box withoutdisconnecting the parts. l

The levers, by means of which the gears are operated, are mounted on theupper ends of vertical spindles journaled in the upper part of the box,while the arms carrying the forks or pins, which directly actuate thegears, are fixed to the lower ends of the said spindles within the box.

To prevent the possibility of both levers being moved to throw theirrespective gears into actionsimultaneously l combine with them a lockingbar.

In the accompanying drawing- Figure 1 is a side elevation illustratingmy improvements; and

Fig. 2 is a sectional plan.

a, Z9 indicate the lower and upper parts, respectively, of the gear box,the part a having cast upon it the blocks c, d which carry the bearingsfor the first motion shaft c and the second motion shaft f,respectively, while the upper part Z9 has cast upon it the correspondingbearing parts or caps The blocks d, a in addition to forming the lowerparts of the bearings for the shaft f, also constitute feet, by means ofwhich the gear box is supported on the main frame g of the chassis, andthe bolts h, h which secure the lower box-part to the frame, also serveto secure the two box-parts together; the bolts i, z' ofthe bearings forthe shaft e also serve as connecting bolts between the two parts.

7a, Z indicate the gears of a two speed pinion which slides upon thefirst motion shaft c, and 7:1, Z1 are speed wheels fixed upon the secondmotion shaft f, the said wheels being designed to gear with the pinions1c, Z respectively. '/L, nl are pinions connected respectively to the`pinion 7c, Z on the shaft e and to the shaft f, and n2 is a wheel ofdouble width for the reverse, this wheel being carried upon acountershaft 0 and being in a normally inoperative or neutral position.When the reverse motion is desired the wheel n2 is moved to engage thesaidI wheels n and nl. n3, a* are collars to prevent the longitudinalmovement of the wheel n2 upon the shaft 0.

The pinion n2 is loosely mounted on the said countershaft 0 which slidesin bearings or bosses p, p on the upper part b of the gear box and doesnot rotate.

It is to be understood that the arrangement of gearing before describedforms no part of my invention and is only described in order that theinvention may be clearly understood.

g, o" are the levers by means of which the gears for the forwardmovement and for the reverse are operated respectively, these leversbeing mounted upon the upper ends of spindles g1, r1 carried in bossesor bearings s, s formed upon, or fixed to, the upper part b of the gearbox.

The spindle g1 has fixed to its lower end a lever g2 carrying at itsouter end a fork which straddles the wheel Z, while the spindle r1carries a lever r2 which engages with a lug on the collar n* fixed tocountershaft I0, so that the movement of the lever g can place thepinions 7c, k1 or Z, Z1 in engagement,

according to the speed required, while the' movement of the lever 1" canmove the pinion n2 into simultaneous engagement with the wheels a, nlfor the reverse.

The levers g, 7 are fixed to their vertical spindles so that theypreferably lie in the same plane, and so that they are located onopposite sides of the steering wheel indicated by the letter t in Fig.2, there y enabling the driver to operate one lever with his right handand the other with his left hand.

u indicates a quadrant mounted upon brackets al, u1 and u2 on'the boxpart Z9, the said quadrant having in it a series of notchescorresponding with the several positions of the levers g, 1 on which arelever catches o, o of ordinary construction designedv to engage with thesaid notches.

fw is the locking-bar for preventing the catches fv, o of both leversbeing simultaneously disengaged, the said locking-bar being pivot'ed atw1 to the bracket a2. This locking bar has in it notches m, 001,corresponding with the lever catches o, o on the levers g, 7respectively when the latter are in their normal or neutral positions,and is pivoted upon the bracket a2 in such relation to the quadrant u asto allow either lever catch v to be withdrawn so that the lateralmovement of the corresponding lever will cause the oscillation of thelocking-bar to engage with the catch e of the other lever to lock it bypreventing the withdrawal of its said catch.

For instance, if the lever catch o of the lever 91, is to be withdrawn,to put in the reverse, it is necessary that the catch 0 of the lever gshould be in coincidence with the notch :c to allow of the locking-bar'w oscillating to a suflicient extent to afford space for the catch o ofthe lever r to move between the locking-bar and, the quadrant, therebypreventing the movement of the lever g until the lever r-has beenreturned tosuch a position that its lever catch is in coincidence withthe notch x1. Vhen -the lever l' is in this position the lever g can bemoved, but not otherwise.

y indicates a spring which normally retains the locking-barl inengagement with the catch of the reversing lever.

a indicates the removable cover upon the box part for affording accessto the interior of the gear box.

Having now particularly .described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is 1. In a progressive change speed and reverse gear set,the combination with a box made of two main parts, bearings formedpartly inthe lower and partly in the upper main part, a first shaft anda second shaft mounted in said bearings, a unitary group of slidablegears mounted on the first shaft,

gears mounted on the second shaft adapted to be engaged by some of thegears of said group, a shiftable reverse gear mounted in the upper partof the box and adapted to be engaged with one of the gears of said.Vgroup and with the last named gear on the second shaft, independentshifting levers pivoted about normally vertical axis and shiftablenormally horizontally for engaging said gears in different relations,and locking mechanism for preventing -movement of one of said leverswhile another lever is out of neutral position.

2. A vprogressive change speed and reverse gear set, comprising a firstshaft, a unitary group of slidable gears thereon, a second shaft, gearsthereon adapted to be engaged by some of the gears of said group,another gear on said second shaft, a shiftable reverse gear adapted tobe engaged with one of the gears of said group and with the last namedgear on the second shaft, and independent shifting levers pivoted aboutnormally vertical axis and shiftable normally horizontally for engagingsaid gears in different relations.

3. A .mechanism of the kind defined in claim 2 in which one of theshifting levers actuates the group of slidable gears and anothershifting lever actuates the reverse gear, and relatively diverging handlevers operatively connectedV with said shifting levers.

4:. A mechanism of the kind defined in claim 2 having hand leversoperatively connected with the shifting levers, and locking mechanismfor preventing movement of one of said levers while another lever is outof neutral position.

HERBERT PEROY SAUNDERSON.

